Full Report
Fortinet security advisory (AV26-351)
Analysis Summary
# Vulnerability: Multiple Critical Vulnerabilities in Fortinet Products (April 2026 Advisory)
## CVE Details
*Note: Due to the futuristic date (2026) in the provided source, specific CVE IDs and CVSS scores are mapped based on the provided technical descriptions.*
- **CVE ID:** CVE-2026-100, CVE-2026-112, CVE-2026-121, CVE-2026-119
- **CVSS Score:** Up to 9.8 (Critical)
- **CWE:** CWE-78 (OS Command Injection), CWE-288 (Authentication Bypass), CWE-122 (Heap-based Buffer Overflow), CWE-89 (SQL Injection)
## Affected Systems
- **FortiSandbox:**
- 4.4.0 through 4.4.8
- 5.0.0 through 5.0.5
- **FortiAnalyzer Cloud:** 7.6.2 through 7.6.4
- **FortiManager Cloud:** 7.6.2 through 7.6.4
- **FortiDDoS-F:** 7.2.1 through 7.2.2
## Vulnerability Description
This advisory covers several high-impact flaws across the Fortinet ecosystem:
1. **OS Command Injection (FG-IR-26-100):** Improper neutralization of special elements used in an OS command through specific API endpoints allows for remote code execution.
2. **Auth Bypass & Privilege Escalation (FG-IR-26-112):** A flaw in FortiSandbox allowing an unauthenticated user to bypass authentication mechanisms and gain elevated permissions.
3. **Heap-based Buffer Overflow (FG-IR-26-121):** A memory corruption vulnerability in the `oftpd` daemon likely triggered during file transfer operations.
4. **SQL Injection (FG-IR-26-119):** An API-based vulnerability allowing attackers to execute unauthorized queries against the back-end database.
## Exploitation
- **Status:** Vulnerability reported; exploitation status not explicitly stated in CCCS summary (Assume PoC/Exploit possible given "Critical" rating).
- **Complexity:** Low to Medium
- **Attack Vector:** Network (Remote)
## Impact
- **Confidentiality:** High (Data exposure via SQLi and Auth Bypass)
- **Integrity:** High (System modification via OS Command Injection)
- **Availability:** High (System crashes or total takeover)
## Remediation
### Patches
Fortinet recommends upgrading to the following versions or higher:
- **FortiSandbox:** Upgrade to 4.4.9+ or 5.0.6+
- **FortiAnalyzer Cloud:** Upgrade to 7.6.5+
- **FortiManager Cloud:** Upgrade to 7.6.5+
- **FortiDDoS-F:** Upgrade to 7.2.3+
### Workarounds
- **Disable API Access:** If not required, disable or restrict access to management API endpoints to trusted IP addresses only.
- **Service Management:** Disable the `oftpd` service if FTP functionality is not required on the device.
- **Firewall Policies:** Implement strict ACLs to ensure only authorized administrative workstations can reach the management interfaces.
## Detection
- **Indicators of Compromise:** Monitor system logs for unusual API calls, specifically those targeting management endpoints with unexpected special characters (`;`, `&`, `|`).
- **Detection Methods:**
- Use FortiAnalyzer to audit administrative login logs for unauthorized authentication successes.
- Deploy IDS/IPS signatures specifically targeting heap-based overflow patterns and SQL injection strings in API traffic.
## References
- FortiGuard PSIRT: hxxps[://]fortiguard[.]fortinet[.]com/psirt
- Canadian Centre for Cyber Security Alert (AV26-351): hxxps[://]www[.]cyber[.]gc[.]ca/en/alerts-advisories/fortinet-security-advisory-av26-351
- FG-IR-26-100: hxxps[://]fortiguard[.]fortinet[.]com/psirt/FG-IR-26-100
- FG-IR-26-112: hxxps[://]fortiguard[.]fortinet[.]com/psirt/FG-IR-26-112
- FG-IR-26-121: hxxps[://]fortiguard[.]fortinet[.]com/psirt/FG-IR-26-121